Ore stamp-mill.



P. N. NISSEN.

ORB STAMP MILL.

APPLICATION FILED SEPT.

Patented Dec. 1, 1914,

Inventor:

Attj

UNITED sTAflllis Pill TENT OFFICE.

PETER N. NISSEN, 0F LOS ANGELES, CALIFORNIA.

ORE STAMP-MILL.

Application filed September 15. 1908.

To all whom it may concern Be it known that I, PETER N. NrssnN, a citizen of the United States, and a resident of Los Angeles, in the county of Los Angeles and State of California, have invented certain new and useful Improvements in Ore Stamp-Mills, of which the following is a specification.

My invention relates to ore stamp mills, and particularly to mills of the character described in Patent No. 776,414 granted to me November 29, 1904. Its objects are, among others, to increase the strength, durability and efficiency of the mortars of such mills; to insure a thorough and effective crushing of the ore and its reduction to a proper state and condition for recovery of the precious metal therein by means of amalgamating plates located outside the same; to prevent the escape of the pulverized ore except through the proper channels during the crushing process; to separate the thoroughly crushed ore from the coarser particles therein, so that the former will pass to the amalgamating plates and the latter will be returned to the dies for further crushing; to increase the crushing power of the stamp; and to supply the ore with the proper quantity of liquid in a manner which will insure a thorough mixture of the same and enable the operator to accurately control the consistency of the pulp.

The invention consists in the construction combination and arrangement of parts hereinafter described and claimed and illustrated in the accompanying drawings.

In the said drawings, Figure l is a plan of a stamp mill embodying my improvements; Fig. 2 is a vertical medial section of the same substantially on the line 2-2 of Fig. 1; Fig. 3 is an enlarged detail of a part of the screen, Fig. 4 is a horizontal medial section of the screen.

The mortar A is of cylindrical form and is provided with a flared base A adapted to be anchored or otherwise secured to a suitable foundation. At the bottom of the mortar cavity is a boss A which is preferably concentric with the walls thereof, but of lesser diameter so that an annular space is left between them. This boss receives the lower crushing die D which is removably supported thereon. The mortar cavity is provided with a suitable lining C which surrounds the die and extends to a point above the same. As the die D and shoe G are concentric with the walls of the mortar and of Specification of Letters Patent.

Patented Dec. 1, 1914.

Serial No. 453,200.

lesser diameter, an annular space is left between them and the said walls, and at the lower part of this annular space is the inlet pipe B which extends through the wall of the mortar and the casing and is adapted to be used to supply liquid to the mortar for the purpose of making a mixture of pulverized ore and water commonly known as the pulp. This inlet aperture is preferably screw-threaded, to receive the threaded end of a water pipe or nozzle. The upper die or shoe G is secured to the lower end of the head H which is in turn secured to a shank or stem K, by means of which the said shoe is operated. The head H is provided with an enlarged portion H which is so located and of such proportions as to fill the barrel or cylinder J from side to side at its upper part, leaving a suflicient space below the said enlarged portion to prevent the same from striking the annular flange I which projects inwardly and downwardly from the lower edge of the cylinder J until it is almost in contact with the head H. It will. be understood that it is necessary to leave a sufficient space between the lower edge of the enlarged portion H and the annular flange I to permit the wearing down of the dies; the drawings represent these parts as they are when new. At the back of the mortar is provided a suitable channel 0 for the admission of ore to be crushed.

The construction of the enlarged head and annular flange serves a number of useful purposes. By increasing the size of the head at this point, it is possible to greatly add to the crushing power of the dies, as in this manner considerable weight is added to the stamp. It also enables the builder of the stamp mill to increase or diminish the weight of the stamp in order to adapt it to the crushing of dilferent ores, since it is a comparatively simple matter to vary the width of the flange I to compensate for the size of the cylinder, which, it will be understood, may be enlarged for the purpose of accommodating a larger head. By this arrangement therefore, the regulation of the size and weight of the head, without a1fecting the other parts of the mortar is made possible. But this is not the only advantage of the arrangement. In practice it is necessary to leave an appreciable space between the head and its cylinder, in order to prevent the said parts from becoming clogged, and this space permits the pulp to splash out at the top of the mortar when the die falls during the operation of the device. \Vith the arrangement shown, however, the splash will first strike the flange I and be deflected against the screen, or back into the mortar, with the exception of a small portion which will fly upward until it strikes the shoulder of the enlarged portion H where it will be checked and caused to fall into the mortar, when the stamp is raised. This prevention of the splashing out of the pulp not only protects the outer parts of the mill therefrom but prevents the escape of Water and pulp not sufliciently ground and effects a material economy by preventing the loss of precious metal in this manner. The enlargement of the head for the purpose of increasing the weight of the stamp rather than placing the weight at some other point is not a mere matter of choice, but has been found to provide the weight at just the proper point and to increase the efficiency and durability of the mill.

In constructing the screen, I take two sheets of the same size, preferably composed of wire of different gages having different meshes and place the screen with the larger mesh and wire inside. The inner screen is held between the strip R and the walls of the mortar at the top and between the strip L and the said walls at the bottom in the manner shown in my patent heretofore referred to, while the outer screen is held between the strips R and L and the battens S and S. These latter are also shown in my said patent. In order to permit the coarser particles of crushed ore which will not pass the finer screen to pass back into the mortar after they have been forced through the inner and coarser screen and to prevent them from clogging the outer screen, I have made the following provi sions: The strip L is provided with a series of inwardly inclined V-shaped notches L extending from a point near the outer screen to the inner side of the strip, and the screen M is provided with a series of enlarged openings 1U. The coarser particles of ore which succeed in passing the inner screen will fall to the bottom of the space between the two screens and into the notches L, from which they will pass, through the openings M, into the mortar. The openings ii are so arranged as to be opposite the notches, and any large particles which may be forced through the said openings by the splash will strike the portion of the strip L in Which the notches are formed and immediately fall back through the notches into the mortar. The construction and arrangement of the double screen which covers the outlet serves a number of purposes; it prevents the larger particles from reaching the outer and finer screen and thus clogging or injuring the same; it separates the coarser from the finer particles in the space between the screens, returning the latter to the mortar; and it permits the use of a very fine screen, and protects the same from damage by the coarser pieces of ore, and in this manner permits the use of screens which more efficiently screen or strain the ulp.

At the sides of the lip F, I have provided wings F and in the vertical outer edge of each of these wings is a groove F which may receive the edge of a board used to cover the outlet and prevent small particles flying through the screen from being lost, checking the same and causing them to fall to the lip. It will be observed that the wings are cast integral with the lip of the mortar. 'Vllhis feature of construction is of great advantage, as it adds strength to the mortar and, in the cooling of the casting in the process of making the mortar, the wings hold the vertical and horizontal axes of the mortar at right angles so that the mortar is easier to cast.

The inlet B for Water is an important feature of my improvements, since it is important that the consistency of the pulp shall be carefully regulated, and this cannot be done when the water is supplied through the ore inlet. WVith the inlet arranged to supply water directly to the annular space surrounding the dies, however, it is possible to maintain the consistency of the pulp at any desired state as well as to insure a thorough mixture at the point where the same is most important, 2'. 6. the level of the dies and screen, which greatly increases the crushing capacity as well as the general efficiency of the stamp and mortar.

I have shown the inlet as provided with a pipe B for supplying water under pressure controlled by a valve B The amount of pressure will, of course, depend upon the height of the pipe or the pressure of the water su ply with which the pipe is connected. desired the highest point of the water supply pipe may be fixed at the level at which the liquid mass is to be maintained in the m rtar or the pipe provided with other means for maintaining the water level and in this way not only the quantity of water but the pressure and the level to which it will automatically rise may be controlled.

Il'hat I claim is:

1. In. a device of the character described, the combination of a substantially cylindrical mortar, having an inlet for ore, an outlet for the crushed product, and a cavity below said inlet and outlet, a die located in said cavity, a stamp or pestle adapted to impinge upon said die, said stamp having an enlarged portion located above and substantially filling the bore of the part of the mill immediately above the stamping chamber,

a Cylindrical portion of the mortar surrounding said enlarged portion and an annular flange surrounding the smaller portion of the stamp between the enlarged portion and the die.

2. In a device of the character described, the combination of a substantially cylindrical mortar, having an inlet for'ore, an outlet for the crushed product, and a cavity below said inlet and outlet, a die located in said cavity,"a stamporpestle adapted to impinge upon said die, said stamp having an enlarged portion located above and substantially filling the bore of the part of the mill immediately above the stamping chamber, a cylindrical portion of the mortar surrounding said enlarged portion and a portion of the stamp below the same, and an annular flange surrounding the smaller portion of the stamp between the enlarged portion and the die.

3. Ina device of the character described, the combination of a substantially cylindrical mortar having an inlet for ore and an outlet for the crushed product and a cavity below said inlet and outlet, a die located therein, a stamp or pestle adapted to impinge upon said die, and a plurality of screens covering the outlet constructed and arranged to leave a space between them, the inner screen having openings at its lower part larger than the meshes of either screen.

4:. In a device of the character described, the combination of a substantially cylindrical mortar having an inlet for ore and an outlet for the crushed product and a cavity below said inlet and outlet, a die located therein, a stamp or pestleadapted to impinge upon said die, and a plurality of screens covering the outlet constructed and arranged to leave a space between them, the inner screen having openings at its lower part larger than the meshes of either screen and a series of inwardly inclined grooves in the horizontal surface of the mortar outside of and opposite to said openings.

5. In a device of the character described, the combination of a substantially cylindrical mortar having an inlet for'ore and an outlet for the crushed product and a cavity below said inlet and outlet, a plurality of screens covering the outlet constructed and arranged to leave a space between them, the inner screen having openings at its lower part largerthan the meshes of either screen and a series of inwardly inclined grooves in the horizontal surface of the mortar outside of and opposite to said opening.

6. In a device of the character described, the combination of a substantially cylindrical mortar, having an inlet for ore, an outlet for the crushed product, and a cavity belO said inlet and outlet, a die located in said cavity, a stamp or pestle adapted to impinge upon said die, said stamp having an enlarged portion located above and substantially filling the bore of the part of the mill immediately above the stamping chamber, the upper part of said stamping chamber having an opening of lesser diameter than uct and a cavity below said inlet and outlet,

a' die located therein, a stamp or pestle adapted to impinge upon said die, having an enlarged portion located above the stamping chamber, a cylindrical portion of the mortar surrounding said enlarged portion and substantially filled laterally thereby and a part of the smaller portion, a portion of the stamp being below the same, and an annular flange surrounding the smaller portion of the stamp between the enlarged portion and the die, having an opening of lesser diameter than the diameter of the enlarged portion.

8. In a device of the character described, the combination of a mortar having an inlet for ore and an outlet for the crushed product and a cavity below said inlet and outlet, a die located therein, a stamp or pestle adapted to impinge upon said die and a plurality of screens covering the outlet constructed and arranged to leave a space between them, the inner screen being made of coarser wire with a larger mesh and having openings at its lower part larger than the meshes of either screen.

9. In a device of the character described, the combination of a. substantially cylindrical mortar having an inlet for ore and an outlet for the crushed product and a cavity below said inlet and outlet, and a plurality of screens covering the outlet constructed and arranged to leave a space between them, the inner screen having openings at its lower part larger than the meshes of either screen, said mortar having a series of inwardly inclined grooves in the horizontal surface thereof outside of and opposite to said openings and extending to the top thereof.

10. In a device of the character described, the combination of a mortar, an inlet for ore and an outlet for the crushed product, a cavity below said inlet and outlet, a die located therein, a stamp or pestle adapted to impinge upon said die and extensions on the walls of said mortar and integral therewith adjacent to said opening comprising vertical flanges on opposite sides of the mortar and a horizontal portion connecting them.

11. In a device of the character described, the combination of a mortar casing provided with inlet and outlet openings and a cavity below said openings, :1 die located in said cavity, a stamp or pestle adapted to impinge upon said die, said stamp being provided m of m 25 my 1 s M m a ith an la ge port n qc sd abms t s aid elwnin and ub tant ally fil ing tbs ore the part Q h m ll mmediately bwe th .tamp. ng c amb a hav ng a consz porti at he Lqwe p rt of he enlargement, and the said casing being fur the {am-sid d w th a fl nge. projec inginard mward he stamp a d xt nding beeath he s d enl g port on- P R N. NISSEN. Witnssses:

S. J. Cox, 4. C. MCDQNA'ELL. 

